Method of forming valve devices



March 22, 1938. E. M. TOLLEFSO METHOD OF FORMING VALVE DEVICES Filed- Nov. 9; 1935 2 Sheets-Sheet 1 FIG. 2

n o 5 l mm o m VM N 5 6 n r E W 4.1M Kttorngs ZJRLVU INVENTOR Ernest M. Tollefson.

2 Sheets-Sheet 2 N O S F E L L O T M E Filed Nov. 9, 1935 METHOD OF FORMING VALVE DEVICES 6 Hm w l the body of the valve device.

,Patented Mar. 22, 1938 PATENT- F E i ..2,;111,7osp '1 j METHOD OF FORMING VALVE DEVICES Ernest M. Tollcfson, Minneapolis, Minn; assignor to Mam-Manufac ur C mpany, Minneap li a c r or ApplicationNovember. 9, 1935, Serial No. 49,070

My invention relates to a method of forming valve devices for regulating the flow of fluids such as fuel oil, gas or the'like, and has for its object to provide a. simple and inexpensive method of making a valve device for that purpose having a high degree of accuracy.

The full objects" and advantages of my-in-. vention will appearin connection with the de tailed description thereof, and its novel features are. particularly pointed'out in the claims.

In the drawings, illustrating the application of my invention in two forms:

Fig. l is a sectional view of a casting forming Fig. 2 is a view similar to Fig. 1 showing a cross-section of the valve opening. Fig. 3 is a fragmentary view of a portion of what is shown in Fig. 2 after finishing the valve face. Fig. 4 is a plan view of the finished valve face showing the valve closure in dotted lines. Fig. 5 is an illustration of the form of punch employed to make the aperture through the valve head into the valve chamber. Fig. 6 shows the punch in its position being driven through the valve head. Fig. 'l is a fragmentary view showing the holder for moving and holding the valve seat closure. Fig. 8 is a sectional view of a casting forming the body of a valve device which is used in carrying out the preferred method. Fig. 9 is a sectional elevation view showing the operation of a preliminary punch. Fig. 10 is a fragmentary View showing the operation of a secondary punch similar to that shown in connection with Fig. 6. Fig. 11 is a perspective view of the preliminary punch. Fig. 12 is a plan view of the device after being operated upon by the secondary punch. Fig. 13 is a sectional view of the device after finishing the valve face.

The form shown in Figs. 1 to 7 will first be described although it is to be understood that the form shown in Figs. 8 to 13 is the preferred form. The same reference numerals so far as applicable will be used in connection with both forms. As illustrated, a casting I is provided formed with an internal chamber I I and a passageway l2 leading thereto and opening into a threaded nipple 33 adapted to communicate with a fluid feed'or discharge pipe not shown. The chamber II is closed with a relatively thick head portion I3. A passageway l4 extends through the casting l0 and opens into a threaded nipple l which is adapted to be connected with a. fuel fluid supply pipe not shown. The passageway I 4 opens through the top surface l6 of the head portion I3, as clearly shown in Figs. 2 and 4.

To form the valve opening a punch I! is provided having a punching extension I8 formed with a rectangular face IQ of a cross-section'suite able to form the desired valve opening. This punch is applied to the surface l6 of the casting I0 and by means of a suitable press or hammer is caused to penetrate through the headj'i-3 into the chamber II, and I have discovered that in this operation the brass'or other metal rormmg the casting I0 is pushed through in a progressively widening strip with slightly --i 'rregular walls as clearly shown at 20in Figs. 2, B-andl. When the surface It is milleddown after thepunchirig operation there will result a rectangular slot 2| through the milled surface l6, as shown in Fig. 4, which slot will open through a continuouslyexpanding channel into chamber H, as indicated in dotted lines in Fig. 4. Control of fluid supply through said slot may be by any suitable member sliding upon the milled face l6 so as to progressively cover a greater or less portion of the slot 2|. Such a member satisfactory for the purpose is shown in Fig. 7, where a rotatable holder 22 is formed with a seat 23 in which slides a piston 24 engaged by a spring 25 within the seat 23, the piston carrying a valve disc 26 which, as shown in dotted lines in Fig. 4, will with rotation of the member 22 progressively cover or uncover more or less of the slot 2|, the member 22 being controlled by a handle of common construction not shown. The chamber II is preferably left open at the bottom of casting l0, having a threaded portion 21 as in Fig. 1, and into which a sealing plug 28 is screwed, as in Fig. 2. V

The form of invention shown in Figs. 8 to 13 which is the preferred form will now be described. In this form, I use a preliminary punch 34 having a wedge-shaped end 35 as shown in Fig. 11. This punch as shown in Fig. 9 is inserted through the opening 21 so that the wedgeshaped end 35 will come into engagement with the head l3. By means of a press or hammer, the sharp end 35 of the punch is caused to form a taperedextension 36 of the chamber H into the head [3 as shown in Fig. 9, it being noted that, the end 35 is not sufliciently long to entirely puncture through the material of the head. In this operation, however, the material is bulged out in the form of a teat 31. To complete the perforation through the head I3, the punch I1 is applied with its extension 18 in central alinement with the tapered extension 36 of the chamber II and forced through in the manner shown in Fig. 10. The surface I6 is then milled down or otherwise smoothed, the teat 31 being removed during this operation so that the finished device appears as shown in Fig. 13.

The advantages of my method will be apparent. Above everything the device is exceedingly inexpensive and simple to make. The punching operation is done quickly and produces the desired effect of an expanding channel without the very highly costly operation of milling such a channel and slot through the head l3, which would necessarily involve expensive and costly machinery. Moreover, it provides a valve aperture cooperating exceptionally well with the milled face l6 of the head member I 3, and the closure disc 26 operable upon said milled face. With this construction any desired flow of fluid may be achieved from zero up to the maximum permitted by the slot 2|.

I claim:

1. A method of forming valve devices which comprises forming a member having therein a centrally disposed chamber with a lateral pa sageway for fluid and provided with a head cl0sing one end of the chamber and the other end thereof being open, inserting a punch having a wedge-shaped end into said chamber, forcing said wedge-shaped end partly through the material of said head to form a tapered extension of the chamber, applying a punch to the face of said head, forcing the last mentioned punch through. the material of said head to open'an aperture in alinement with said tapered extension, and sealing up said open end of thechamber.

2. A method of forming valve devices which comprises forming a member having therein a centrally disposed chamber with a lateral passageway for fluid and provided with a head clos ing one end of the chamber and the other end thereof being open, inserting a punch having a wedge-shaped end into said chamber, forcing said wedge-shaped end partly through the material of said head to form a tapered extension of the chamber, applying a punch to the face of said head, forcing the last mentioned punch through the material of said head to open an aperture in alinement with said tapered extension, sealing up said open end of the chamber, and smoothing off the face of said head for engagement by a disc valve.

3. A method of forming valve devices which comprises forming a member having therein a centrally disposed chamber with a lateral discharge passageway for fluid and having a head closing one end of the chamber and the other end thereof being open, providing the inner surface of said head with an inverted V-shaped medially disposed groove, applying a punch to the face of said head, forcing said punch through the material of said head to open an aperture in alinement with the apex of said medially disposed groove, and sealing up said open end of the chamber.

ERNEST M. TOLLEFSON. 

